Welcome to day 263 of 365 photos…the back yard is where I spent the biggest part of the day today. Mr. B and a friend were working on the new pergola and I was hanging around to help them when they needed it. Guess you know where I took today’s photos. In the last few […]
We all hear talk about the docks regarding boat zincs at haul out, but what do they really do?
Any time you have two different metals that are physically or electrically connected and immersed in seawater, they produce electrical current. Some current flows between the two metals and it can dissolve metals such as props, shafts, thru hulls and sea strainers in the engine room. The way we stop galvanic corrosion is to add a piece of metal called a sacrificial anode, and most often it is zinc. In fact, most of us refer to sacrificial anodes simply as boat zincs. On the Galvanic Scale, Zinc is number 4, 1 being the most sacrificial to seawater, Aluminum is 12, Steel is 30, Brass is 51, 316 Stainless is 76 and pure Gold is 91. This is why zinc is used, we want it to erode away and protect the other metal down there. Using zinc anodes on your boat is very important. When a zinc is gone, the metal component it was installed to protect begins to dissolve. Boat Zincs should be replaced when about half of the anode has been lost to corrosion. Ideally we want that to occur not more frequently than annually. I check these routinely and replace zincs that need it. At haul out, a full set is always installed. All zincs are not made the same. Insist on MIL spec zincs. Here is a supplier that I get mine from, BoatZincs.com. Good zincs, good price.
Boat Zincs – Props and Rudders
Propellers are normally protected by a zinc collar bolted together around the shaft. It is necessary to make sure the shaft is clean and polished before clamping the collar to it. Metal rudders and struts are protected with zinc disks bolted directly to the metal. Be sure bottom paint does not cover them. To provide good contact, the zinc should be tapped with a hammer all around and tightened several times during installation.
Boat Zincs – Hull Plates
Bonding is the connecting together of zinc plates bolted to the hull to other metals. All the underwater gear and the metal inside the engine room is connected to these plates. Be sure you check the bonding between thru-hulls and other metal gear by the use of a multi-meter set on the ohm settings.
Tip: If you spot “green” bronze fittings, the bonding has failed and corrosion is in progress. Check and restore the bonding.
Boat Zincs -Cooling Water
The weather was not cooperating with us to do the Mississippi Sound to Biloxi so we had to sit and wait! If the forecast for the MS Sound is calling for 3 to 5 foot seas and 15 to 20 knots of wind, we stay put!!!!! Ponchartrain Landing is pr…
I often get asked how much effort is involved in building your own boat. My usual answer is ‘twice as much as you think’. In reality it’s likely even more. Doing it on your own requires a lot more pre-planning and I don’t find myself doing a lot of tha…
Roanoke, VA USA
I was feeling rather bad that I’d not written for ages when my sister forwarded me an email from friends asking if I’d stopped writing or had their address been lost or what. It has been a while since my last email. Writer’s block isn’t the reason or disastrous happenings either [...]
Welcome to day 262 of 365 photos…National Coffee Day – now there is a holiday to celebrate!Camera: Nikon D7100 – Lens: Nikon 18-300mm Focal Length: 44mm – Aperture: f/5.0 – Shutter Speed: 1/60 second – ISO: 900 From Wikipedia: “International Coffee Day (also known as Coffee Day or National Coffee Day) is an annual event […]
One question that is frequently asked when you are undertaking the US Great Circle Loop is, “Where do you cross your wake?” For us it wasn’t a simple answer. We have been traveling the US east coast and the Bahamas for over 10 years, so technically, wh…
Welcome to day 261 of 365 photos…Here birds, there birds, everywhere birds! Shore birds, that is. Today I went on a NC Coastal Federation birding cruise on the White Oak River. It was a spectacular day – not too warm – not too cold – just right! The only slight problem was that we had […]